#666CA3#666CA3

#666CA3 is a mid, moderate blue. Relative luminance 0.162; OKLCH L 54.9% C 0.086 H 278.4°. Best body text is #FFFFFF at 4.95:1 contrast (WCAG AA passes).

Color values

HEX	#666CA3
RGB	rgb(102, 108, 163)
HSL	hsl(234, 25%, 52%)
HSV	hsv(234, 37%, 64%)
CMYK	cmyk(37.4%, 33.7%, 0%, 36.1%)
CIE-LAB	lab(47.23, 11.65, -30.36)
CIE-LCH	lch(47.23, 32.52, 290.99°)
OKLab	oklab(54.94% 0.0125 -0.0848)
OKLCH	oklch(54.94% 0.086 278.4)
XYZ	xyz(17.4510, 16.1936, 36.8494)
Luminance	0.1619 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CA3 #A39D66

analogous

#668BA3 #666CA3 #7F66A3

triadic

#666CA3 #A3666C #6CA366

tetradic

#666CA3 #A3668B #A39D66 #66A37F

square

#666CA3 #A3668B #A39D66 #66A37F

split-complementary

#666CA3 #A37F66 #8BA366

monochromatic

#363959 #4D527F #666CA3 #8C91BA #B2B5D1

Accessibility & contrast

On white

4.95

#666CA3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.24

#666CA3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CA3

4.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CA3	#FFFFFF	#000000	##FFFFFF
##666CA3	1.00	4.95	4.24	4.95
#FFFFFF	4.95	1.00	21.00	1.00
#000000	4.24	21.00	1.00	21.00
##FFFFFF	4.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5A72A5

Deuteranopia (green-blind)

#576EA2

Tritanopia (blue-blind)

#557780

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #666ca3;
/* rgb */ color: rgb(102, 108, 163);
/* oklch */ color: oklch(54.9% 0.086 278.4);

Tailwind

colors: {
  custom: {
    50: '#9496be',
    500: '#666ca3',
    950: '#000000',
  },
}

SCSS

$custom: #666ca3;
$custom-light: #9496be;
$custom-dark: #000000;

JSON

{
  "hex": "#666ca3",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 163
  },
  "hsl": {
    "h": 234.098,
    "s": 24.898,
    "l": 51.961
  },
  "oklch": {
    "l": 0.5494,
    "c": 0.08577,
    "h": 278.4
  },
  "luminance": 0.16194
}

Semantic roles & 50–950 ramp

primary

#666CA3

secondary

#C0BDA5

accent

#B866C1

background

#F9F9FB

surface

#F2F1F7

border

#CCCBD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666CA3

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →